Diaphragm pump



FIG. 1 is a front right isometric view of the diaphragm pump;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof,

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in FIGS. 3 and 7 are included for the purpose of illustrating portions of the diaphragm pump that form no part of the claimed design. 

CLAIM The ornamental design for a diaphragm pump, as shown and described. 